I apologize for the delay. I didn't realize anyone responded to my forum post because I received no email notification. I simply checked my post again, on a whim.
I would say try an old firmware, but you'd risk the shutdown bug. Maybe wait for the next firmware and see if that fixes it, if not, raise a support ticket.
I don't want to go back. I'd rather have a Pebble working 95%, than a Pebble which won't power on. :D
I had this same issue and other people as well. Our experiences were posted in a thread called: "Accelerometer Not Activating Backlight". One thing that seemed to maybe fix it was running the battery down on the pebble until it won't turn on anymore. Then connecting it to the charger brings up recovery mode and a flashed firmware will then sometimes fix it. Worth a try. Report back if you have any luck.
With Pebble turned off this morning, I attached the charger and it went to Recovery Mode. By connecting my phone, it wanted to redownload the firmward, 1.9.1, which I allowed. The phone rebooted and it's charging now. I just tried the wrist flick, and BAM! It's working!
Please note, I had not discharged the battery all the way down, however.
If not working, submit a ticket from the app and then PM the Case # you get from the auto-reply to me. I wanna get as many instances of this on our Devs' radar.
Problem solved! (Couldn't get your link to work, fyi.)